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Can Not Provide For Host Variables In Antlr3 Sql Grammar

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I have a SQL grammar which do not have support for host variables. I want to provide support for host variables in that but a situation that I have encountered is tricky. There is

Solution 1: 

JSON_OBJECT('KEY' : VALUE)

syntax is not supported in IBM i COBOL. This can only be provided in the form of 

JSON_OBJECT (KEYkey VALUE value)

In the case of COBOL when COLON is followed by something, it should be treated as host variable.

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